Saint-Jean-Cap-Ferrat is a commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region in Southeastern France. In 2…Saint-Jean-Cap-Ferrat is a commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region in Southeastern France. In 2012, Cap Ferrat was named the second most expensive residential location in the world after Monaco.